/*
 * @Author: your name
 * @Date: 2021-03-10 15:31:54
 * @LastEditTime: 2021-03-10 15:43:40
 * @LastEditors: Please set LastEditors
 * @Description: In User Settings Edit
 * @FilePath: /cpp-imsoftware/include/ThreadPool.h
 */

#ifndef THREAD_POOL_H
#define THREAD_POOL_H

#include <condition_variable>
#include <functional>
#include <future>
#include <memory>
#include <mutex>
#include <queue>
#include <stdexcept>
#include <thread>
#include <vector>

const size_t maxThreadsNum = std::thread::hardware_concurrency();

class ThreadPool
{
private:
    // need to keep track of threads so we can join them
    std::vector<std::thread> workers;
    // the task queue
    std::queue<std::function<void()>> tasks;

    // synchronization
    std::mutex queue_mutex;
    std::condition_variable condition;
    bool stop;

public:
    explicit ThreadPool(const size_t threads);

    template <class F, class... Args>
    auto enqueue(F &&f, Args &&...args)
        -> std::future<typename std::result_of<F(Args...)>::type>;

    ~ThreadPool();
};

// the constructor just launches some amount of workers
inline ThreadPool::ThreadPool(const size_t threads) : stop(false)
{
    for (size_t i = 0; i < threads; ++i)
        workers.emplace_back(
            [this] {
                for (;;)
                {
                    std::function<void()> task;

                    {
                        std::unique_lock<std::mutex> lock(this->queue_mutex);
                        this->condition.wait(lock, [this] { return this->stop || !this->tasks.empty(); });
                        if (this->stop && this->tasks.empty())
                            return;
                        task = std::move(this->tasks.front());
                        this->tasks.pop();
                    }

                    task();
                }
            });
}

// add new work item to the pool
template <class F, class... Args>
auto ThreadPool::enqueue(F &&f, Args &&...args) -> std::future<typename std::result_of<F(Args...)>::type>
{
    using return_type = typename std::result_of<F(Args...)>::type;

    auto task = std::make_shared<std::packaged_task<return_type()>>(
        std::bind(std::forward<F>(f), std::forward<Args>(args)...));

    std::future<return_type> res = task->get_future();
    {
        std::unique_lock<std::mutex> lock(queue_mutex);

        // don't allow enqueueing after stopping the pool
        if (stop)
            throw std::runtime_error("enqueue on stopped ThreadPool");

        tasks.emplace([task]() { (*task)(); });
    }
    condition.notify_one();
    return res;
}

// the destructor joins all threads
inline ThreadPool::~ThreadPool()
{
    {
        std::unique_lock<std::mutex> lock(queue_mutex);
        stop = true;
    }
    condition.notify_all();
    for (std::thread &worker : workers)
        worker.join();
}

#endif